The theoretical description of Strong Interaction in terms of Yang-Mills gauge theory, is able to describe
well only the asymptotically free regime at short distances, where quarks and gluons behave as almost free particles.
On the other hand, no satisfactory derivation of the confining potential at large distances has been obtained in this
theoretical framework, since in the strong-coupling regime perturbation theory cannot be applied.
However, several papers have put forward the idea that the confining effect should be attributed to the Abelian sub-group
of the \(SU\left(\,N\,\right)\)  symmetry group of \(QCD\) . The original hypothesis of Abelian domiance [1]}, [2]},
has been investigated in depth by many authors, e.g.
[3]}, [4]}, [5]}, [6]}, [7]}, [8]}, [9]}, [10]}, [11]}.
